Furnace wall construction



April .14, 1942 L. H. HosBElN FURNAGE WALL CONSTRUCTION" 4 Sheds-Sheet 1` filed oct. 1.8, 1959 Ali" ' ATTORNEY.

April 14, 1942. L. H. HosBElN FURNACE WALL CONSTRUCTION Filed oct. 18, 1939 4 Sheets-Sheet 2- INVENTOR /asefr'ff ATTORNEY.

April 14, 1942- l.. H. HosBElN Y 2,279,515 y FURNACE WALL CONSTRUCTION 4 Sheets-Sheet 3 v Filed Oct. 18, 1939 April 14, 1942- L; H..HosBE|N FURNACE WALL CONSTRUCTION Filed Oct. 18, 1959 4 Sheets-Sheet 4 -intimal Apta-1 4, 1942 rUnNAoE wam. CONSTRUCTION f Louis n. Homin, Glencoe, nl., assiznor to M. n. Detrick Company. Chicago, Ill., a corporation /of Delaware Application October 18, 1939, Serial No. v300,020 y This invention relates in general to furnace construction, and more ,particularly to improvements in sectionally supported walls. The instant application is a continuation in part of my co-pending application, Serial No. 269,401, filed the provision of a wall for` high-temperature furnaces comprising relatively thin refractory members sectionally supported in staggered relationship to each other by metal members having min'- imum contact therewith.

A further important object of the invention is the provision of such a wall which includes aV backing of plastic material substantially enclosing said metal supporting members and eliminating substantially all air spaces in the Wall.

Another object of the invention is the provision of such a furnace wall that is relatively inexpensive, is adapted to beverected and repaired from the exterior" ofv the furnace, and that may employ a simple, low cost, readily removable outer casing.

A further object of the invention is the provision of such a furnace wall which is so designed that the metal supporting structure, the refractories, and the insulation material may be separately and successively erected in the construction thereof.

Url

12 claims. (o1. 724101) Figure 5 is a perspective view of one of the auxiliary hanger members of Flgs..1 and 2;

Figure 6 is a perspective view of one of the horizontal retaining members of Figs. 1 and 2;

Figure 7 is a perspective view of one of the main refractory supporting hanger members of Figs. 1 and 2; l

Figure 8 is a transverse,` horizontal section through a modified construction of furnace wall embodying the features of theinvention;

Figure 9 is a transverse, vertical sectional view ofthewalloflig;l v

Figure 10 is a perspective view of a modified form of auxiliary hanger'member employed in the wall of Figs. 8 and 9; I l

Figure 11 is a perspective view of one of the horizontal retaining members of the wall of Figs.8and9;and f Fig. 12 is a perspective view of one of the modified main refractory supporting hanger members of Fig. 9.

Referring more particularly to Figs. 1to 7 of the drawings, reference numeral II indicates a Another important object of the invention is the provision oi a relatively thin wall for hightemperature furnaces of simplified construction with an outer surface of plastic material having finish characteristics, thereby eliminating the need for a sheet metal outer finish casing.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, when taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

In the drawings,

Figure 1 is a rear elevational view of a furnace wall embodying the features ,of the invention with parts broken away and partly in section to show the interior. construction thereof;

Figure 2.is a transverse, vertical section taken substantially on'the line 2-'2 of Fig. 1;

Figures 3 and 4 are perspective views of one of the refractories or tiles employed, taken from the top and bottom thereof. respectively;

vertically disposed frame member,v of which a `plurality are provided in spaced relationship longitudinally from' each other in the direction of the wall. A plurality of horizontally disposed frame or supporting members I2 are secured by means of ybolts I 3 to the vertical frame members IIL to provide a skeleton frame for the wall having any suitable or desired type of -foundation therefor. The framemembers I-I may be of any suitable shape, while the horizontal frame members I2 are provided with longitudinally extending recesses I4 in their inner surfaces (Fig. 2)

and longitudinally extending, marginal recesses I5 and IB along the upper and lower edges of their rear surfaces (Figs. 1 and 2). The recess or channel It is positioned a short distance below the horizontal center line of each of the frame members I2, and the latter are preferably provided with a plurality of elongated apertures Il extending. therethrough substantially on the center line thereof. The apertures I1 are spaced longitudinally of the members I2 for the purpose of accommodating the bolts I3 and for another purpose to be later more fully described.

The inner surface of the instant furnace wall (to the rear of Fig. 1 and to the right in Fig. 2) comprises a plurality of refractory tiles or bricks, indicated generally by reference numeral I8. Referring more particularly to Figs. 3 and 4, each l of the bricks or tiles IB is in the shape of a rectangular parallelogram having front and rear surfaces I9 and 2l, respectively. top and bottom 'downwardly extending hook member 42.

surfaces 22 and 23, respectively, and right and left end surfaces 24 and 25, respectively. It will be understood that the refractory I8 is being viewed fromy the rear in Figs. 3 and 4. The top surface 22`is provided with a longitudinal groove 26 disposed adjacent the rear surface 2I, and the lower surface 23 is provided with a similar groove which comprises three separated portions 21, 28 and 29. The grooves 21, 28 and 29 are in longitudinal alinement with each other and in vertical alinement with the groove 26. The rear surface 2| of the refractory is cut away at its lower edge at 3l, 32 and 33 to provide access to the grooves 21, 28 and 29, respectively, from the rear of the'- brick. The upper surface 22 ofthe refractory I8 is also provided with a longitudinal groove 34 extending parallel to the groove 26 adjacent the front surface I9. The groove 34 is in vertical alinement with a groove 35 extending in communication therewith along the left hand end 25 of the tile. The grooves 34 and 35 are appreciably more shallow than the grooves 26 to 29. The right hand end 24 of thetile is provided with a flange 36 which is in vertical alinement with the grooves 34, 35 and extends outwardly from the end surface a distance substantially equal to the depth of the latter grooves. The bottom surface 23 is provided with a similar rib portion 31.

When the refractories I8 are laid in the manner shown in Figs. l and 2 to form the inner portion of the wall, the bricks of adjacent horizontally disposed rows are positioned in staggered relationship relative to each other, with the ribs or flanges 31 of one row of bricks engaging within the grooves 34 of the bricks of adjacent rows, and the ribs 36 and grooves 35 engaging with the respective grooves and ribs of the adjacent bricks of the same roW. With this arrangement, the joints between the refractories I8 extending from the front to the rear thereof will be in broken-lines instead of straight lines to prevent leakage transversely through the wall, and each of the separate tiles will aid in maintaining the ones adjacent thereto inproper alinement.

Means are provided for sctionally supporting the several refractories I8 and for facilitating the erection and removal and replacement thereof from the rear of the wall. Removably mounted upon the several horizontally disposed frame or supporting members I2 are a plurality of main refractory supporting hanger members, indicated generally by reference numeral 4I. As will be seen in Figs. 2 and '7, each of the hanger members 4I comprises a main body portion which is. disposed transversely of the wall and terminates at the rear adjacent the upper end thereof in a The rear edge of the hanger member 4I is cut away at 43 adjacent and below the hook 42, and terminates at its lower end in a rearwardly extending pad 44. With such conilguration, the hanger eight in number for example, although engaging only the lowermost one of this group of refractories. Such engagement is had only between the cut-away portion 32 of the tile and the flange 45 of the hanger member, and between the lugs V4I and the groove 28 (Fig. 2), if the hanger 4I is positionedY to engage the central part of the lowermost refractory I8. It is preferred, however, that the end portions of two adjacent tiles in the same row be engaged and supported by the hanger 4I, as shown in the drawings. When the tiles are so laid, engagement is had cnw between the flange 45 of the hanger member 4I and the end cut-away portions 3 I, 33 of adjacent refractories, and between the lugs 46 and the end grooves 21, 29. The flange 45 thus functions to provide the necessary vertical support for the associated group of refractories I8, the weight of the latter being transmitted to the associated horizontal frame member I2 by the hook 42 and v pad 44 of the hanger 4I.

Means are provided for retaining the remaining refractories I8 of the group orsection supported by the hanger 4I in proper vertical alinement to prevent inward bulging of the wall. An

auxiliary hanger member, indicated generally by a hook member 54 extending upwardly therefrom and formed integrally therewith. The upper and lower ends of the body portion 52 terminate in transversely spaced, forwardly extending pads 55.

An auxiliary hanger member 5I is removably mounted upon a horizontal frame member I2 in vertical alinement with each of the main hanger member 4I is adapted to be removably mounted upon a horizontal frame member I2 with the hook 42 engaging within the 'upper channel or groove I5, the cut-away portion I43 providing -clearance for the upper part of the frame member I2, and the pad 44 resting against the forward surface of the frame members. At its forward end, the hanger member 4I is provided with a forwardly extending flange 45 which terminates in upwardly extending, longitudinally spaced lugs 46. Each of the hanger members 4I is adapted to support a plurality 'of refractories I8, 75

members 4 I. The upper end of the hook member 54 of the auxiliary hanger 5I engages within the groove I4 in the forward surface of the horizontal frame member I2, with the upper pair of pads 55 being disposed within the lower marginal groove I6 in the rear surface of the frame member. The lower pair of pads 55 engages within the upper marginal groove I5 of the next lower horizontal frame member I2 and on either side of the hook 42 of the next lower main hanger member 4I. A plurality of cross pieces 56 are disposed in suitable recesses provided in the flanges 53 of the auxiliary hanger member 5I and are rigidly secured thereto in any desired manner. The cross` pieces 56 are vertically spaced from each other a distance equal to twice the height of the refractories I8.

A horizontally disposed retaining member, indicated generally by reference numeral 6I, is adapted to be mounted upon each of the cross pieces 56. Each of the retaining members 6I (Figs. 2 and 6) terminates at its rear end in a downwardly extending flange portion 62 which engages behind the associated cross piece 56, the main body portion of the retaining member 6I extending between the flanges 53 of the auxiliary hanger member 5I. The forward end of the retaining member 6I comprises a horizontally disposed shell 53 which terminates at its outer end in spaced, vertically disposed flanges 64 extend` refractories I8, when properly mounted as shown in Fig. 2, to prevent forward bulging of the wall.

lgroove 28 in the lower surface of one refractory I8 and the lower flanges 64 will engage the end portions of the grooves 26 in the upper surfaces of the two refractories in the next lower row, it is not essential to have a retaining member 6| disposed between the next two lower rows of refractories. In other words, it is only necessary to employ retaining members in the joints between every other row of tiles, as shown in Fig. 1.

It will be seen that the central cut-away portions 32 of the refractories I8 provide clearance for the shelfs 63 of the retaining members 6I.

Since the main hanger member 4| is entirely unconnected with the refractory or refractories I8 directly below it, it is necessary that the retaining members 6I be so spaced vertically, that the upper one associated with the auxiliary hanger member 5I is disposedbetween the two upper refractories of a particular section or group. With an even number of refractories in each vertically disposed section or group, the lower retaining member 6I associated therewith will be disposed between the two lower refractories of the section, as shown at .the top of Fig. 2. In order to reduce the weight of the auxiliary hanger member 5I, the flanges 53 are cut away adjacent the lower end thereof, and the lower retaining member 6I is supported and held against forward transverse movement' by the main hanger member 4I. by providing a rearwardly extending shoulder 65 at the upper end of the main hanger member 4I (Figs-2 and 7). The shoulder 65 .is disposed in vertical alinement with the cross pieces 56, and the rear flange 62 of the associated member 6I engages this shoulder in the same manner as the other members 6I engage the cross pieces 56.

This arrangement has the additional advantage of enabling two upper rows of refractories `I8 -to be added to the top of the wall with the use of only one member 4I and one member 6| per sec-` tion or group of refractories, while eliminating the necessity of employing an additional auxiliary hanger member 5|. The wall may thus be built up above the top horizontal frame or supporting member I 2 so as to afford complete protection for the latter. In order to provide for vertical expansion -of the wall, a suitable high temperature resistant material is interposed between the lower refractories of each section or group and the upper refractories of the next lower section, to provide an expansion joint 66 (Fig. 2). This material will completely fill the adjacent grooves in the refractories and entirely cover the forward end of the main hanger members 4 I.

After all of the refractories`or tiles I8 vhave been laid to provide the inner portion of the wall, in the manner above described, the space between the rear surfaces of the refractories and the spaces between the insulation blocks 61 and all spaces extending rearwardly from the front surfaces of the horizontal frame members I2 and th auxiliary hanger members 5I are then filled with a suitable plastic insulation material 68. The plastic material 68 thus forms a continuous `sheet of insulation which terminates at its rear This is accomplished edge.

surface slightly to the-rear of the rear surfaces of the horizontal frame members I2.

A plurality of vertically extending plates 69 are then mounted at the rear'of the-wall to provide Y an outer casing therefor. The plates 69 may be of substantially the same width as the insulation blocks 61. In order to rigidly retain the casing plates 69 in position, the auxiliary hanger members 5| are provided with a plurality of vertically spaced, rectangular apertures 1I centrally disposed in the main body portion 52 thereof. Each of the apertures 1I is provided with a semi-circular, cut-away portion or extension in its lower A bolt 12 is adapted to be inserted into each of the apertures 1| from the rear of the wall, the inner head of the bolt being narrower in width than the main portion of the aperture 1I. When the bolt 12 rests uponthe lower surface of the aperture 1I, however, the lower portion of the head thereof engages against the front surface of the body portion 52 of the auxiliary hanger member 5I. Elongated, vertically disposed outer batten strips 13 having suitable longitudi- Anally spaced apertures therein are then mounted upon the plurality of bolts 12. Suitable nuts 14 are screwed upon the bolts 12 to draw the batten` members I2. With this arrangement, and since an excess of plastic insulation material 68 has been spread upon the rear surface of the blocks '61, such excess plastic insulation 68 will be forced into any available air spaces by the tightening of the nuts 14 on the bolts 12. Consequently, substantially all air spaces in the wall will be eliminated. It will be readily understood that the rea'r casing plates 69 may be of any suitable width or length. For example, instead of being of a length substantially equal to the height of the 'furnace wall and of a width substantially equal result, while providing a furnace wall with anouter surface having nish characteristics, the auxiliary hanger members 5I of the wall of Figs. 1 tov'? have been altered in construction, and the shapos'of the main refractory supporting hanger members 4| and the retaining members 6I have also been changed.

Referring more particularly to Figs. 8 to l2, the wall therein disclosed comprises a plurality of vertically disposed frame members II, identical to the members II of the first modification, and 'a plurality of horizontally disposed frame or supporting members 82, which are similar to the supporting members I2 of the first modification, and are secured t0 the vertical frame members I I by means of bolts I3. The frame members 82 are each provided with a centrally disposed, longitudinally. extending recess 84 in the inner surface thereof (Fig. 9), and longitudinally extending, marginal recesses 85 and 86 along the upper and/lower edges.

` A plurality of main refractory supporting hang- Ahanger members 4 I.

er members, indicated generally by reference nulmeral 9|, are provided which 'are identical in function and similar in construction to the main Each of the main hanger members 9| (Figs. 9 and 12) comprises a main body portion which is disposed transversely of the wall and terminates at the rear upper end .thereof in a vertically anged pad 92. The rear edge of the hanger member 9| is cut away at 93 adjacent and below the pad 92, and terminates at its' lower end in a rearwardly extending pad 94. With such configuration, the under surface of the upper pad 92 is adapted to rest upon the upper edge of the horizontal frame member 82, as shown in Fig. 9, with the lower pad 94 resting against the rear wall of the recess 84, and the cutaway portion 93 providing clearance for the upper part of the frame member 82. At its forward end, the hanger member 9| is provided with a forwardly extending, horizontal shelf 95 which terminates in a vertical fiange 96 extending above CII and below the shelf 95. The upper, rearwardly extending stud 92 of the member 9| is provided with vertical fianges 91 which protrude laterally therefrom for a purpose to be later more fully described.

An auxiliary hanger member, indicated generally by reference numeral |0|, is removably mounted upon a horizontal frame member 82 in vertical alinement with each of the main hanger members 9| in similar manner to the positioning of the hanger members 5| of the -construction of Figs. 1 to 7. Each of the auxiliary hanger members |0| (Figs. 9 and 10) comprises an elongated member having an imperforate base or back portion |02, a pair of outwardly and forwardly extending, parallel anges |03, and a hook member |04' extending upwardly therefrom, the members |02, |03 and |04 being formed integrally with each other. The upper end of the hook member |04 engages within the groove 84 of the horizontal frame member 82 (Fig. 9) with the upper end of the base member |02 being disposed within the lower marginal groove 86 in the rear surface of the frame member. The lower end of the plate or base member |02 engages within the upper marginal groove 85 of the,next lower horizontal frame member 82. The parallel flanges |03 terminate short of the ends of the base member |02 to permit such engagement of the latter with the associated recess in the horizontal frame member 82.

Each of the anges |03 is provided with a plurality of laterally and inwardly extending lugs |06 spaced vertically from each other a distance equal to twice the height of the re- `fractories I8. The lugs |06 on the two flanges Thus, while the vertical component re-l sulting from the weight of the refractories |8 any possibility of hot spots in the rear surface of the wall due to the transmission of heat thereto by the mainv hanger members 9|, the

latter distributing the heat more effectively to the metal frame work than the main hanger members 4|.

A horizontally disposed retaining member, indicated generally by reference numeral |II, is adapted to be mounted upon each pair of lugs |06 of the auxiliary hanger member |0|. Each of the retaining members I II (Figs. 8, 9 and 11) terminates at its rear end in a vertically disposed pad ||2 having a horizontally disposed shelf portion ||3 formed at the upper. end thereof. The

.pad ||2 is adapted to be positioned behind the associated lugs |06 of the auxiliary hanger member I0|, and the shelf ||3 rests upon the upper surfaces of the lugs |06 (Fig. 9) to maintain the retaining member'in proper position. 'I'he forward end of the retaining member comprises a horizontally disposed shelf ||4 which terminates at its outer end in Alaterally spaced, vertically disposed fianges ||5 extending above and below the shelf ||4. These retaining members I function in identical manner to the retaining members 6| of the construction illustrated in Figs. 1 to 7.-

It will be readily apparent that the refractories I8 are supported and maintained in proper position by the members 9|, I0| and I in the same manner as by means of the members 4|, 5I and 6|. After all of the refractories or tiles I8 have been laid to provide the inner portion of the wall, in the manner hereinbefore described, the space between the rear surfaces of the refractories and the forward surfaces of the horizontal frame members 82 is substantially filled with blocks ||1 of any suitable heat resistant or insulation material, which are substantially identical to the blocks 61. Since these insulation blocks are wider than they are high, it is readily apparent that they may be inserted between adjacent auxiliary hanger members |0| with their longest dimension disposed vertically, and then rotated through to bring them into proper position. The blocks II1 may thus be stacked one upon the other behind the refractories I8, as shown in Figs. 8 and 9. The spaces between the insulation blocks II1, those surrounding the main body portions of the hanger members 9| and retaining members I I and' all spaces extending rearwardly from the blocks 61 to the rear surfaces of the horizontal frame members 82 and the auxiliary hanger members I0| are then filled with a suitable hard, weather-proof plastic material ||8. The plastic |8 is finished ofi flush with the rear surface of the horizontal frame members |0I, so as to give an outer surface to the furnace wall which is susceptible of having any desired exterior finish, such as paint or the like, applied thereto. furnace wall may thus be greatly enhanced,

while this modified construction eliminates the l Referring to Fig. 8, it will be noted that theA marginal anges of the vertical members and IIJI constituteretaining means for the plastic material H8.

From the above description, it will be clearly understood that the complete wall of either modified construction herein disclosed may be assembled or constructed from the rear thereof, or from the exterior of the furnace. Another important advantage of this furnace wall is that The appearance of the exterior of the bricks, means mounted on said horizontal members for engaging a relatively small portion of any subsequent time, come in and lay the refractories I8, including the insertion or placing of the members 4I and 6l or9l and III. After this part of the job has been completed, the insulation men may lay -the blocks 61 or II'I and apply the insulation material 68or the plastic material H8. will necessitate the return of the metal workers to complete the construction of the wall, but the modified structure illustrated in Figs. v8 to 12 may be completed in separate', successive steps by different groups of workmen entirely independently of each other.

In like manner, if it becomes necessary to re- The use of the casing plates lis pair any particular section or sections of the instant wall, such sections may be readilyremoved and replaced from the exterior of the furnace. This has the material advantage of eliminating the necessity of the usual delay attendant upon cooling down of the furnace when any repairs to the walls are necessitated. In addition to being relatively inexpensive in construction, the instant wall has lextremely low heat transfer characteristics, While maintaining all the advantages of a hard refractory wall. The usual v hot spots to be found in prior art walls are completely eliminated, substantially all air spaces within the Wall are filled, and the amount of metal employed and its contact with the refractories forming the inner portion of the wall are reduced to a minimum.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts Without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described. being merely'a preferred embodiment thereof.

I claim:

l. A furnace wall, comprising a supporting frame, a plurality of interengaging refractories mounted in staggered relationship relative to eachother, hanger means mounted on said frame in spaced relation to said refractories for engaging only a relatively small portion of each of said refra'ctories to support and positively retain the same in proper alinement, and a backing of insulation material for said refractories substantially enclosing said hanger means.

2. A furnace wall, comprising a' supporting frame including a plurality of horizontal mem-` bers, a plurality of identical refractory bricks, means mounted on said horizontal members for engaging a relatively small portion ofonly some of said bricks to support said bricks and whole sections of bricks disposed above and adapted to be supported by said engaged bricks and thus to support all of said bricks, and separate means mounted on said horizontal members independently of said first means for engaging only a relatively small portion of each of the unengaged bricks to positively retain the same in proper alinement.

3. A furnace wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of refractory -said main hanger members and only some of Asaid bricks to support said bricks and whole sections of bricks disposed above and adapted to be supported by said engaged bricksand thus to support all of said bricks, a plurality of vertical members removably mounted on said horizontal members, and means mounted'on said vertical members for engaging only a relatively small portion of each of the unengaged bricks to retain the same in proper alinement. l

4. A relatively thin furnace wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of refractory bricks mounted in interengaging sec' tions, separate means mounted on said horizontal members engaging a relatively small portion of only some of the bricks of each vsection to support said bricks and the sectionsadapted to be supported by said engaged bricks, and separate means mounted on said horizontal members independently of said first means for engaging only a relatively small portion of certain of the unengaged bricks to retain the same in proper alinement.

5. A relatively thin furnace wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of' yrefractory bricks mounted in interengaging sections, main hanger members mounted on said `horizontal members for engaging a relatively small portion of only some of the bricks of each section to support said bricks and the sections adapted `to be supported bysaid-engaged bricks,

an auxiliary hanger member mounted on a said horizontal member in association with each of said main hanger members, and a plurality of retaining members mounted on each `of said auxiliary hanger members for engaging only a relatively small portion of the unengaged bricks to maintain the same in proper alinement.

6.,-A rrelatively thin furnace Wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of refractory bricks mounted in interengaging sections, main hangermembers mounted. on said horizontal members for engaging a relatively small portion of only some of the bricks of each section to support said bricks `anci the sections adapted to be supported by said engaged bricks, an auxiliary hanger member mounted on a said horizontal member in association with each of said main hanger members, a plurality of retaining members mounted on each of said auxiliary hanger members for engaging only a relatively small portion of the unengaged bricks to maintain the same in proper alinement. and a backing of insulation material substantially enclosing saidretaining members.

'7. A relatively thin furnace wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of refractory bricks mounted in interengaging sections, main hanger member mounted on said horizontal members for engaging a relatively small portion of only some of the bricks of each section to support said bricks and the sections adapted to be supported by said engaged bricks. an auxiliary hanger member mounted on a said horizontal member in association with each of said main hanger members, a plurality of retaining members mounted on each of said auxiliary hanger members for engaging only a relatively small portion of the unengaged bricks to maintain the same in proper alinement, a backing of insulation material substantially enclosing said main hanger members and said retaining members, and a metallic casing held in rigid engagement with the rear surface of said backing of insulation material.

8( A furnace wall, comprising ,a supporting frame, a plurality of refractory bricks, meansmounted on said frame for engaging a relatively small portion of only some of said bricks to support said bricks and whole sections of bricks disposed above and adapted to be supported by said engaged bricks and thus to support all of said bricks, separate means mounted on said frame independently of said first means for engaging h posed above and adapted to be supported'by said engaged bricks and thus to support all of said bricks, separate means mounted on said frame independently of said rst means forengaging only a relatively small portionof the unengaged bricks to retain the same in proper alinement., a plurality of blocks of insulation material mounted in engagement with the rear surfaces of said bricks, a backing of plastic insulation material substantially filling all air spaces in said wall and enclosing said supporting and retaining means, and a metal casing held in rigid engagement with said backing of` plastic insulation material.

10. A furnace wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of refractory bricks, a plurality of vertically disposed hangers removably mounted on said horizontal members, a plurality of horizontally disposed hangers each removably engaging and supported by a said member and a `said vertical hanger for engaging a relatively small portion of only some of said bricks to support said bricks and whole seetions of bricks disposed above and adapted to be supported by said engaged bricks and thus to support all of said bricks, and means removably mounted on said vertical hangers for engaging only a relatively' small portion of each of the unengaged bricks to retain 'the same in proper alinement.

. 1l. A relatively thin furnace wall adapted to be constructed and repaired from the exterior of the furnace, comprising a skeleton metal frame, a plurality of identical hard refractory bricks adapted to be laid sectionally in interengaging relationship from the exterior of the furnace to form the inner portion of the wall, hanger means removably mountable on said frame from Athe exterior of the furnace for engaging only a relatively small portion of each ofsaid bricks to support and retain the same in proper alinement, a plurality of insulation blocks adapted to be laid between said hanger means in engagement with the rear surfaces of said bricks, and a backing of plastic material substantially filling all air spaces in the walland enclosing said brick engaging hanger means.

l2. A relatively thin furnace wall, comprising a supporting frame including a plurality of vertically spaced, horizontal members, a plurality of identical refractory bricks mounted in interengaging sections, main hanger members mounted on said horizontal members and spaced vertically and horizontally from each other for engaging a relatively small portion of only some of the bricks of each section to support said bricks and the sections adapted to be supported by said engaged bricks, an auxiliary vertically disposed hanger member mounted on said horizontal members in association with each of said main hanger members and spaced rearwardly from said bricks, and a plurality of horizontal retaining members mounted on each of said auxiliary hanger members and extending inwardly therefrom, eachof said retaining members terminating at its inner end in laterally spaced lugs for engaging only a relatively small portion of the unengaged bricks to maintain thesame in proper alinement.

LoUIs H. HosBErN. 

